Expansion burnishing tool



Nov. 23

J. E. ANEERSN BXPANSIGN BURNISHNG T001r Filed June 1.926

Patented Nov. 23, 1926.

llllll'lE JACOB B. ANDERSON, 03E' IJIERRILL, IOVJA.

EXPANSON BURNISI-IING TOL.

Applicatin filed .Tune 3, 1926.

My invention relates to a tool for sizing the inner diameters of wristpin bearings, and the like, and it is my object to provide such a toolof simple, durable and inexpensive construction, in which the actionupon the bushing of the bearing is produced by a burnishing process asopposed to cutting.

More particularly it is my object to provide a tool for use in workingupon material such as bronze or babbitt, the burnishing being done bybit or Wedge having a rounded face adapted to Contact with the materialof the bearing.

A further object is to provide such a tool having a removable bit ofwedge-shape, actuated by an adjusting element, a novel connection beinghad between the adjusting element and the bit, whereby the bit may beretracted by a pin and slot connection, and positive pressure betransmitted to the bit directly 'l'or expanding the same.

With these and other objects in view, my invention consists in theConstruction, arrangement and combination of the various parts oi mydevice, whereby the objects contemplated are attained, as hereinaftermore fully set forth, pointed out in my claim and illustrated in theaccompanying drawings, in which:

Fig. 1 is a plan view of the tool.

Fig 2 is a sectional view illustrating the tool received in a bearing.

Fig. 3 is a transverse sectional view taken through the line 3 3 of Fig.2.

Fig. is a detail sectional view taken on the line ll-Ll of Fig. 2.

l have discovered that by using a` suitable rotatable burnishing 'tool ahard glazed iinish can be given to a bushing such as bronze, or babbitt,which has better wearing qualities than the finish produced by cutting.The metal in such an operation is compressed to give the bushing theproper size.

l have used the reference char cter 10 to indicate the wrist pin bearingof a connecting rod, and the reference numeral 11 to indicate the bronzebushing therein.

The burnishing tool comprises a plug` or shaft, 12, having a reducedportion, 13, and an enlarged collar, 14, the latter to prevent the toollrom dropping through the bushing when the tool is used in an uprightposition. .el squared head, 15, is designed to receive a wrench forrotating the plug.

A slot, 16, is cut longitudinally in the plug and receives awedge-shaped bit or burnish- Sclial No. 113,@2'5.

ing wedge, 17. The slot, 16, is cut upon the slant to correspond withthat or the wedge, 17 so that the outer edge or' the wedge will remainparallel to the anis of the plug. This outer edge is linished upon acurve. as at 18 (see Fig. 3), the curve being of much less diameter thanthe bushing into which the tool is inserted. "A

The diameter of the plug, 12, is very little less than that of thebushing, 11. l lind that better results are thus obtained.

I provide a very simple means l'or moving the wedge longitudinally inthe slot, 1G, in order to adjust it radially ot the plug, An opening,19, is tapped into the end oi the plug, and this opening is threaded, asat 20,- during a portion of its length. it rod, 21, having a reducedshaft portion.I 22, is slipped into the opening, 19, and thence extendedrearwardly through the end of the plug. A threaded sleeve, 23, is thenreceived over the reduced portion, 22, and the end of the reducedportion swaged down, as at 2li- The threaded sleeve, 23, has an axialhead, 25, to receive a wrench for rota ing the sleeve.

The pin, 26, on the rod, 21, prevents removal oi" the rod from the tool,and serves to tit within slot, 27, in the butt end-of the wedge, 17.

A notch is cut in the end of the wedge, 1T, below the slot, El?, to forma shoulder, Q8, which is received against the end of the rod, 21. i

l/Vhen the rod is moved inwardly in the plug, the pressure trom the endthereof transmitted to the shoulder, 2S, to torce the wedge outwardlyagainst the surface which it engages. When the rod is moved in the otherdirection tle wedgeI is retracted by means o the pin and slotconnection.

A series oi' gauge marks, 29, are provided on the reduced portion, 13,and the end ot' the wedge, 17, coacts therewith to indicate the amountof expansion.

The wedge is held in place by a set screw, 81, which coacts with a slot,3Q, in the wedge, parallel to the lower edge thereof. The wedge may beremoved by removing the screw.

Some changes may be made in the construction and arrangement oi theparts of my invention without departing from the real spirit and purposeof my invention, aud it is my intention to cover by my claim anymodified forms ot structure or use ot meehanieel equivalents which mayhe reesonably included Within their scope.

I claim as my invention: i

In a, device of the class described, e. cylin drieel plug having alongitudinally inclined slot, an axial opening in the end of Jehe plugcommunicating with seid slot, said opening being threaded, a`lournishing` Wedge slidah-ly received in the slot, said Wedge having eslot and e shoulder at its butt end, e rod having a pin received in theslot of said Wedge, sind `iis end engaging seid shoulder, fsaid rodbeing slidably mounted `in the threaded opening and having a reducedportion, a, threaded sleeve receiving` said reduced peiI- tion andthreaded into the threaded opening, Ineens `for transmitting rotatingInovenient to seid sleeve, land Ineens for traneinitting rotatingmovement to the plug.

Signed in the county of Plymouth and State oi'lowa, thisv 27th dey ofMay, 1926.

' JACOB B. ANDERSONL

